Floor Insulation
FLOOR INSULATION
Floors- Floors are another hard-to-insulate area. The big question is which kind of floor insulation is appropriate for certain applications.

Floors over an unconditioned crawl space can be insulated with a closed-cell spray foam, open-cell spray foam or fiberglass batt insulation.
  • Option A Closed-cell spray foam would provide the maximum R-Value and an air barrier as well as a vapor barrier. Installed at a thickness of 4” (R-25).

  • Option B Open-cell spray foam would also provide a good R-Value and may be the best choice when insulating a floor above a crawl space where a bathroom or kitchen is present. If for some reason water should spill onto the floor and find its way through to the insulation the open cells will allow it to drain. Installed at 6 ½ “ you will have a total of R-30.

  • Option C Fiberglass batt insulation may be used when you are on a budget. Installed carefully with the Kraft vapor barrier up (to the warm side) it can be effective.
Floors over a garage when the ceiling has been finished with drywall, insulation options are somewhat limited. Do not worry, densely packed fiberglass will do a good job. By drilling 2 ½” holes between each floor joist every 8’-10’ we can shove a hose into the cavity and fill it with insulation. We then install a wooden plug to fill the hole and it is ready for finish work. Installed at 10” thickness it will have an R-Value of 30.

Floors over an unconditioned basement where the ceiling of the basement is not finished can be insulated with fiberglass batts.

Floors that are insulated over a conditioned basement will not see an increase in energy efficiency. However, the residence will see some sound control benefits.

All of these applications provide an excellent sound barrier. The better the product, the better the sound barrier.
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